16 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
The muscles of the oral surface of the disk are very conspicuous, and are 
arranged in sixteen bi-forked bundles, containing both circular and radial 
muscle fibres. The bundles lying adjacent to the tentacles are about twice as 
broad as those that lie near the sense organs. 
The genital organs protrude from the oral surface of the disk as four com- 
plexly fimbricated sacs. The four oral fringes are very wide, and their free 
edges are sharply folded. 
The general color of the substance of the disk is a delicate opalescent yellow, 
reminding one of the medieval glass of Venice. The muscle system of the oral 
wall of the bell is of a delicate pink, as are also the genital organs. The oral 
fringes are of a most exquisite and delicate rose-color, and the entoderm of the 
tentacles is port-wine colored. The sense organs bear an intense orange pig- 
ment. The diameter of the disk is 180mm. The medusa was found swim- 
ming in great numbers in Largs Bay, near Adelaide, South Australia, on May 
29, 1896. 
This species is similar in some respects to Cyanea Muellerianthe, that was 
described by Haacke! from the Gulf of St. Vincent. C. Muellerianthe is, 
however, smaller than Desomnema rosea ; the shape of the marginal lappets 
and muscle bands is different, and, above all, there are several rows of ten- 
tacles in each crescent, instead of a single row, as is characteristic of the 
genus Desmonema. It also bears some resemblance to Cyanea annaskala, von 
Lendenfeld.? 
Crambessa mosaica Haeckel. 
Plates II. and III. 
Cephea mosaica Quoy et Gaimard, 1824; Voyage de l’Uranie, Zoologie, p. 569, 
Plate 85, Fig. 3. 
Rhizostoma mosaica F. Eschscholtz, 1829; System der Acalephen, p. 53. T. H. 
Huxley, 1849; Phil. Trans. Roy. Soc., pp. 422, 452, Plate 38 (Figs. 26, 27), 
Plate 39 (Figs. 28-34). 
Catostylus mosaicus L. Agassiz, 1862; Contrib. to Nat. Hist. of U. S., Vol. IV. p. 
152. Grenacher und Noll, 1876; Abhandl. Senckenberg. Ges., Bd. X. p. 38. 
Catostylus Wilkesii L. Agassiz, 1862 ; Contrib. to Nat. Hist. of U.S., Vol. IV. p. 152. 
Crambessa mosaica E. Haeckel, 1879; Das System der Medusen, p. 622. R. von 
Lendenfeld, 1883; Zeitschrift fiir Wissen. Zool., Bd. XX XVIII. p. 635. R. von 
Lendenfeld, 1884; Proc. Linn. Soc. New South Wales, Vol. IX. Part IT. p. 299. 
R. von Lendenfeld, 1884; Proc. Linn. Soc. New South Wales, Vol. IX. p. 926; 
Medusze of the Australian Seas, Part I. p. 30, Sydney, 1887. Zeit. fiir Wissen. 
Zool., 1888, Bd. XLVII. Heft 2, pp. 218, 281-242, Pls. 19, 21, 23-27. 
Although so much has been written concerning the anatomy and histology 
of this medusa, no figure of it has as yet been given, if we except the sketch 
by Quoy and Gaimard in the Voyage de l’Uranie, Plate 85, Fig. 3. We there- 
1 Haacke, W., 1887; Jenaische Zeitschrift, Bd. XX. pp. 605-614, Plate 36. 
2 R. von Lendenfeld, 1882; Zeit. Wiss. Zool., Bd. 37, p. 465, Pl. 27-33. 
